Artificial teeth and encasement therefor



Dec. 12, 1939.

M. KROOP ARTIFICIAL TEETH AND ENCASEMENT THEREFOR Filed June 17. 1959 INVENTOR WITNESSES Jill/ache; Kr jv ATTO RN EYS Patented Dec. 12, 1939 ARTIFICIAL TEETH AND ENCASEMENT THEREFOR Mischa Kroop, Brooklyn, N. Y.

Application June 17, 1939, Serial No. 279,639

2 Claims.

This invention relates to artificial teeth and encasements for posterior teeth and has for an object to provide specially designed artificial teeth with corresponding supporting encasements of a construction that may be readily used as upper and lower bicuspids and molars, whereby the artificial or set-in teeth are properly supported and held in place in these encasements without exposing the latter to View.

Another object of this invention is to provide a structure wherein the artificial or set-in teeth are made of porcelain or any other suitable material and are cemented in their respective encasements so that the cusps or masticating surfaces, the saddles or the curved under surfaces resting on the gums, and the buccal or surfaces facing the cheeks are completely metal free.

An additional object of the invention is to provide a structure wherein a thorough anchorage of the supporting means is provided and includes a substantially U-shaped structure partly surrounding the rear of the artificial teeth and where a desired pin or pins extend into the artificial teeth.

Another object of the invention is to provide a construction where a tooth can be replaced without having to remove the bridgework from the mouth.

In the accompanying drawing Fig. 1 is a rear view of artificial tooth constructed in accordance with the present invention;

. Fig. 2 is a sectional view through Fig. 1 approximately on the line 22, the encasement being 35 shown mounted in functioning position;

Fig. 3 is an interior perspective view of the encasement shown in Fig. 2;

Fig. 4 is a fragmentary view showing part of the jaw and the inner surface of the fixed bridge- 40 work embodying the invention applied thereto;

Fig. 5 is a view similar to Fig. 4 but showing a view from the exterior. I

Referring to the accompanying drawing by numerals, l indicates an artificial tooth which may be porcelain or other material and 2 indicates an encasement.

In forming the teeth I the exterior thereof will naturally conform to the bicuspids or molars both in size and shape so that when mounted in the mouth they will give the usual appearance as indicated particularly in Fig. 5 of the drawing. The front surface 3 is of the usual shape of teeth of this kind and also the top 4. The bottom, how'- ever, is concave or saddle shaped, as indicated at 5 and can be ground to properly fit the gum when in use. As illustrated, particularly in Figs. 1 and 2, the back and sides of the tooth or teeth are cut away, as at 6, to receive the backing or .encasement 2, as illustrated particularly in Fig. 2. The cutaway part 6 extends from point 1 near the top of the tooth to point 8 near the bottom of the tooth, and the material at points 1 and 8 is inclined or beveled while at the ends 9 and IU of the cutaway portion the walls are preferably arranged to extend substantially radially with respect to the tooth.

In forming the cutaway portion 6, a groove I l is provided extending from wall 9 to wall Ill. The encasement 2 may be of .gold or other suitable metal and may be integral with bar 30 and with a bead 3|, but preferably the bar 30 is made of a strong metal wire. The U-shaped bar or rod 30 is arranged in a suitable mold and then the gold or other metal forming the encasement 2 is poured into place, whereby the molten metal will flow around the bar. 3|)v so that all parts will be embedded and thereby cast in place so that the finished complete encasement will be as shown in Fig. 3. After the tooth has been formed as shown in Fig. 1 and the complete encasement formed as shown in Fig. 3, a desired cement is applied to the cutaway part 6 including groove l I. Also cement is preferably applied to the inner surface of the encasement 2, as shown in Fig. 3. The encasement is then placed in position, as shown in Figs. 1 and 2, and held in this position until the cement hardens. This completes the formation of the tooth.

It will be readily understood that one, two, or more teeth of this kind may be arranged together and secured in the mouth as illustrated in Figs. 4 and 5, Fig. 4 indicating the interior of the jaw and Fig. 5 the exterior. As shown in Fig. 4, the teeth l8 and I9 are artificial teeth constructed as shown in Fig. 2. These casements are soldered together along line 20 and at lines 2| and 22 are soldered respectively to the inlay 23 and the cap 24 mounted on the respective live teeth 25 and 26. It will be seen that the encasements 2 of the respective artificial teeth and most of the other metal parts are hidden. As shown in Figs. 4 and 5, the cap 24 encircles only part of the front of the tooth 26 but covers the entire top and back so as to provide a desired anchorage. In this way a desired form of fixed bridgework for artificial teeth is provided, while disclosing only a small amount of the gold used in the bridgework. It will be understood that when the artificial teeth have been correctly mounted, as shown in Figs. 4

and 5, they are fixed or permanently mounted and cannot be removed except by a dentist.

As shown in Figs. 1 and 2, auxiliary sockets or bores 28 and 29 are provided. These sockets or bores are arranged in the end walls 9 and I0 so as to receive the ends 32 and 33 of bar 30. From Fig. 1 it will be seen that the tooth I is provided with an inwardly extending groove merging at its ends into the bores 28 and 29.

I claimi 1. In a device of the character described, an artificial tooth formed with a substantially U- shaped recess at the back, an inwardly extending groove positioned midway between the top and bottom of the recess, said groove at each end merging into a bore extending into the tooth, and an encasement substantially fitting said depression, said encasement being provided with an embedded substantially U-shaped bar extending inwardly from the inner surface of the encasement having the ends projecting beyond the encasement and fitting into said bores for anchoring the encasement to the tooth, said embedded U-shaped bar fitting into said groove.

2. In a device of the character described, an artificial tooth formed with a concave bottom conforming to the shape of the gum of a person using the device, a substantially U-shaped recess at the rear extending from near the top of the tooth to near the bottom thereof, an inwardly extending groove positioned substantially midway between the top and bottom of the recess and a bore extending from each end of the groove into the tooth, and an encasement formed with a body adapted to snugly fit into said recess and fill the same, said encasement being formed With an embedded U-shaped rod having the ends projecting into said bores and the body thereof fitting into said groove whereby the tooth is anchored on the encasement so that it cannot have any movement independent of the encasement.

MISCHA KROOP. 

